AT A GLANCE
Why go?
Tiefen See — the German name still on some maps for Poland's Lake Nożyce — is a quiet, forest-fringed lake in the Warmian-Masurian Voivodeship, separated from the busier Lake Piasutno by a narrow natural causeway. With a maximum depth of over 11 metres, sandy-muddy bottom, and water clarity allowing bottom visibility of four to five metres, it lives up to its old name, which translates simply as "Deep Lake."↗↗
This is a place for unhurried summers: wild small beaches, a handful of private docks, and holiday-cottage clusters tucked into the pine forests on its eastern and southern shores. Anglers come for tench and pike; swimmers and snorkellers come for the clear water and the sense of solitude that the neighbouring, more popular Piasutno cannot offer.↗↗
What Makes Tiefen See Special
Nożyce is an elongated lake running roughly northwest to southeast, covering about 55 hectares and holding an average depth of six metres — unusual for a small Masurian lake. Its floor drops sandy then silty, and in 1994 water-quality surveys rated it Class II, among the cleaner bodies of water in the Warmian-Masurian region. The surrounding landscape is quintessential Mazury: gentle hills in the north, flat and softly rising shores elsewhere, and waterlogged meadows fringing the upper end where herons patrol the reed beds.↗↗
The lake's most distinctive feature is its relationship with Lake Piasutno immediately to the west. A narrow natural causeway (grobla) separates the two basins, and the only straightforward access route for visitors runs along that spit about half a kilometre from the main road. Elsewhere the shores are steep and densely wooded, keeping crowds away and lending the water an almost secluded quality despite cottage settlements dotting the northeast and southeast margins.↗↗
Historically the area belonged to East Prussia, and the lake appeared under several German names before the 1939 rebranding to Tiefen See. Earlier maps recorded it as Piasuden Klein (1595), Nocine See (1933), and Nozice See (1922), reflecting its position as the "small" companion to Piasutno.
What to See and Do
Swimming and paddling: In summer the water warms quickly — visitors recall it being "warm as soup" in July. The shallow entry on the causeway side lets you wade for a long time before the bottom drops away, while the steeper southern and eastern shores offer deeper, more secluded spots where you can actually see the sandy floor below.↗
Fishing: Lake Nożyce belongs to the Mazovian PZW fishing district and is officially classified as a tench-and-pike water, though bream and perch are also present. Anglers report that the lake has been recovering from a difficult stretch and that a fishing permit (seasonal or annual) can be arranged through the PZW office. The quiet, less-trafficked setting makes a morning or evening session here feel intimate.↗↗
Nature walks and birding: The wet meadows at the northern end, the mixed forest encircling the basin, and the proximity to the vast Piska Forest (Puszcza Piska) to the east make this a rewarding spot for a short hike or wildlife watch. Mushroom and blueberry picking is popular in late summer among visitors staying at the local holiday centres.↗↗
Getting There and Practical Tips
The lake sits near the village of Piasutno in Gmina Świętajno, Szczytno County. From the town of Szczytno, follow national road 53 north to Świętajno (about 12 km), then continue north on a paved road toward Piasutno. The easiest approach to the shoreline is a sandy track that runs along the causeway separating Nożyce from Piasutno, roughly 500 metres from the nearest hard-surface road. In the remaining directions the banks are steep and forested, so access is limited unless you are staying in one of the lakeside holiday cottages.↗↗
There are no organised bathing facilities, boat rental shops, or official parking lots at the lake itself. Accommodation comes in the form of private holiday-cottage clusters on the northeast and southeast shores, plus the larger Ośrodek Piasutno-100 complex just across the causeway on Lake Piasutno, which rents cabins, bikes, and pedal boats. Bring your own supplies; the village of Świętajno, with shops and a charming small church, is about six kilometres south.↗↗↗
Visitors should be prepared for a genuine "off-the-beaten-track" experience: the lake is appreciated precisely because it remains low-key, with minimal signage and infrastructure. Litter has occasionally been noted near the roadside accesses during peak season, so packing out what you bring helps preserve the character that draws people here in the first place.
A Brief History of the Name
Before 1945, this corner of southern Masuria was part of East Prussia, and German cartographers catalogued the lake several times. It first appeared in records as Piasuden Klein — "Little Piasutno" — back in 1595, reflecting the local Old Prussian-language substrate. In the twentieth century it was re-rendered as Nocine See (1933) and Nozice See (1922), before being renamed Tiefen See in 1939, a descriptive German title meaning "Deep Lake" that aptly marks its notably greater depth compared to its shallow neighbour.↗↗
What makes it special
Max depth over 11 metres with bottom visibility of 4–5 metres — genuinely one of Masuria's clearer, deeper small lakes↗↗
Separated from Lake Piasutno by a narrow natural causeway; easy access only along that sandy spit↗
The German name "Tiefen See" means "Deep Lake" and dates from 1939; earlier records used Piasuden Klein (1595)↗
A little planning goes a long way
- Approach via the sandy causeway track from Piasutno — the only straightforward access to the water. Other shorelines are steep, forested, and difficult to reach without a boat.↗
- No lifeguard, no rental, no food stalls on site. Stock up in Świętajno (6 km south) before heading to the lake.↗↗
- For fishing, obtain a Mazovian PZW permit (seasonal or annual). The lake is known for tench, pike, bream, and perch.↗
- Combine a visit with neighbouring Lake Piasutno, which has a proper beach and bathing area — a nice contrast if you want facilities after enjoying Nożyce's solitude.↗↗
About this guide
Compiled with AI assistance from the sources below; this is not a first-hand visit. Place details collected October 5, 2026. Hours, access and ratings can change; confirm with the venue before visiting.