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Sweden
Södermanland

Trosa

Top 6 Natural Monuments around Trosa

Natural monuments around Trosa, Sweden, showcase a diverse natural landscape within the Sörmland archipelago. This region features environments ranging from coastal archipelagos with unique suspension bridges to ancient archaeological sites and varied forest types. The area provides opportunities to explore significant geological formations and rich biodiversity. Trosa offers a range of natural sites for outdoor activities.

Best natural monuments around Trosa

  • The most popular natural monuments is Stendörren Nature Reserve, a natural monument that offers diverse environments from shore…

Last updated: May 9, 2026

Drunnviken - Stendörren Nature Reserve

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One of the most beautiful tours we have hiked with the family. The Naturum is a small museum/exploration center and is free. The tours are very well signposted.

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Stendörren Nature Reserve

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It is worthwhile to have picnic food and something for the grill. There are barbecue areas with wood everywhere.

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Swimming Spot at Sörsjön

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A nice place to take a bath on a MTB tour

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Giant's Pothole

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The giant’s kettle is a deep, rounded hole in the bedrock created during the last Ice Age. Glacial meltwater with swirling stones and gravel eroded the rock over thousands of …

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This is a great place for a swim and to fill up on water or if you are looking for a place to set up your tent for the night. …

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Adie
December 11, 2025, Giant's Pothole

The giant’s kettle is a deep, rounded hole in the bedrock created during the last Ice Age. Glacial meltwater with swirling stones and gravel eroded the rock over thousands of years, leaving behind a smooth, cylindrical pothole. This one is perhaps the most impressive example in all of Sweden. The visible hole has a depth of about 4 meters, and beneath it is a second, smaller kettle roughly 2 meters deep — nested inside the larger one, which is quite rare. You can see the twisted grooves and polished walls that are evidence of the abrasive action of stones tumbling in swirling meltwater under the ice. Be careful you don't slip into the kettle, especially when it's wet!

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Fresh spring water & a small sandy beach

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Amazing! The best hiking boots I've had in Sweden so far. A wonderful place!

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A very well-signposted tour. It's best to wear sturdy shoes, as it's easy to twist your ankle. If the weather's nice, don't forget your swimsuit and barbecue gear, as there are many beautiful spots where you can grill.

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There is a perfect spring there to fill up bottles.

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One of the most beautiful tours we have hiked with the family. The Naturum is a small museum/exploration center and is free. The tours are very well signposted.

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A nice place to take a bath on a MTB tour

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This is a great place for a swim and to fill up on water or if you are looking for a place to set up your tent for the night. There are picnic tables and a fire place as well as a small stream of clean water right next to the small beach.

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Frequently Asked Questions

What are some of the most popular natural monuments to visit around Trosa?

Among the most popular natural monuments around Trosa, visitors frequently highlight Stendörren Nature Reserve and Drunnviken - Stendörren Nature Reserve. Stendörren is known for its diverse environments, from shore meadows to rocky areas, and offers unique suspension bridges to archipelago islands. Visitors also enjoy the Swimming Spot at Sörsjön for its fresh spring water and sandy beach.

Are there natural monuments around Trosa that are suitable for families?

Yes, several natural monuments around Trosa are family-friendly. Stendörren Nature Reserve and Drunnviken - Stendörren Nature Reserve are excellent choices, offering marked trails, barbecue areas, and a visitor center with exhibitions and activities for children. The Swimming Spot at Sörsjön and the Natural spring by the small beach, Tullgarns Naturvårdsområde also provide pleasant spots for families to relax and swim.

What unique natural features can I expect to see in the Trosa area?

The Trosa area boasts diverse natural features. At Stendörren Nature Reserve, you can experience the unique Sörmland archipelago with its system of suspension bridges connecting islands, smooth glacially-scoured granite cliffs, and brackish Baltic Sea waters. Lånestaheden Nature Reserve features a landscape reminiscent of the Öland Alvar, with limestone bedrock supporting rare plant species, open meadows, and hazel groves. You can also find a remarkable Giant's Pothole, a deep, cylindrical hole formed during the last Ice Age, considered one of the most impressive examples in Sweden.

Can I find historical or archaeological sites within the natural monuments near Trosa?

Yes, Lånestaheden Nature Reserve is particularly rich in cultural-historical values. Its landscape, with limestone bedrock, is also one of the richest archaeological areas in Sörmland, featuring ancient remains from the Iron and Bronze Ages, including rock carvings. This reserve offers a unique blend of natural beauty and historical significance.

What kind of outdoor activities can I do near Trosa's natural monuments?

The natural monuments around Trosa offer a wide range of outdoor activities. You can enjoy hiking on marked trails, swimming, picnicking, and birdwatching. For more structured activities, there are numerous running, hiking, and gravel biking routes available. For example, you can explore various hiking trails around Trosa, including sections of the extensive Sörmlandsleden, or try running trails and gravel biking routes that pass through scenic areas.

Are there good hiking opportunities around Trosa's natural monuments?

Absolutely. The Trosa area is excellent for hiking. Stendörren Nature Reserve has marked trails and an observation tower with panoramic views. The Sörmlandsleden, an extensive hiking trail, passes through Trosa municipality (stages 53-56), offering varied landscapes from forest walks to sea views. You can find many more options for hiking around Trosa, including moderate loops like the 'Sörmlandsleden: Gisesjön and Björken Loop'.

What do visitors enjoy most about the natural monuments in Trosa?

Visitors particularly enjoy the diverse natural beauty and the opportunities for outdoor recreation. Many appreciate the well-signposted tours and the ability to walk out to archipelago islands via suspension bridges at Stendörren. The availability of barbecue areas with firewood, picnic spots, and places to swim, like the Swimming Spot at Sörsjön, are also frequently mentioned as highlights. The overall peacefulness and stunning scenery receive high praise.

When is the best time to visit the natural monuments around Trosa?

The natural monuments around Trosa are beautiful year-round. Spring and summer offer lush greenery, vibrant flora, and ideal conditions for swimming and hiking. Autumn brings colorful foliage, while winter provides a serene, often snowy, landscape for those prepared for colder temperatures and potentially icy trails. The Naturum Stendörren visitor center is open year-round, providing information regardless of the season.

Are there any nature reserves near Trosa besides Stendörren and Lånestaheden?

Yes, Trosa is home to several other notable nature reserves. These include Tomtaklintskogen Nature Reserve, an urban forest gem located near Trosa center, and Kråmö Nature Reserve, an idyllic archipelago island accessible by a short boat ride. Borgmästarholmen, a Natura 2000 area, is also significant for its noble deciduous forest, ancient oaks, and rich birdlife.

Can I find places to swim or fill up water bottles at the natural monuments?

Yes, there are excellent spots for both. The Swimming Spot at Sörsjön offers a small sandy beach and fresh spring water perfect for swimming or refilling bottles. Additionally, the Natural spring by the small beach, Tullgarns Naturvårdsområde is another great location for a swim and has a stream of clean water for refilling.

Are the natural monuments around Trosa generally accessible?

Many areas within the natural monuments, particularly at Stendörren Nature Reserve, are designed to be accessible. The unique system of suspension bridges allows visitors to walk out to the archipelago islands without needing a boat, making the archipelagic landscape more approachable. While some trails may require sturdy shoes due to uneven terrain, efforts are made to ensure a broad range of visitors can enjoy the natural beauty.

What kind of wildlife might I encounter in the natural monuments?

The diverse environments around Trosa support various wildlife. In the brackish waters of the Baltic Sea at Stendörren, you can find unique plant and animal life, including various seabirds. Borgmästarholmen is known for its rich birdlife, and the maintained meadows of Lånestaheden, grazed by sheep, contribute to a rich flora that supports local insects and small animals. Keep an eye out for different bird species, especially near coastal and forested areas.

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