Kristýna is a striking lake in the far north of the Czech Republic, tucked just a kilometer from where Czech, German and Polish borders meet. What was once a lignite mine has turned into one of the region's most inviting summer escapes, with clean water and a relaxed, lakeside vibe.

The lake has an egg-shaped outline covering roughly 14 hectares, reaching depths of up to 28 meters. Its shores are lined with grass, with woodland wrapping around the northern and southern edges, and a sandy beach giving visitors a proper spot to swim or sunbathe. The Lužická Nisa river runs along the western shore, adding to the scenery. Summers here are lively with swimmers, windsurfers and sailors, while in autumn and winter the place turns quiet and peaceful — a nice change of pace for a walk.

• Hrádek nad Nisou — about 1.5 km northwest, easy route, roughly 20-30 minutes on foot
• Car access is possible almost to the shoreline, with parking nearby

• A campsite with cabins for rent is located on site
• Swimming area, windsurfing and sailing equipment rental available
• Briefly closed for swimming after the 2010 flood — fully open again today

The lake takes its name from the Christian mine shaft, named after Count Kristián Kryštof Clam-Gallas, who kicked off coal mining here back in the 18th century — today all that mining history has given way to a crystal-clear lake.