stuff to do in.cologne
DE

Birdwatching (resting habitat for migrating waterfowl, breeding sites)

1 places in Cologne

Kiesgrubensee Gremberghoven© Mabit1 · CC BY-SA 4.0

Kiesgrubensee Gremberghoven

2.3(3)· Google

A former gravel pit lake within Cologne's city limits, designated a nature reserve since 1989 – home to nesting kingfishers, sand martins, and great crested grebes.