Pieterburen

Pieterburen is a small village behind the Wadden dyke with two things. The seal centre was founded in 1971 by Lenie 't Hart, who began taking in sick and orphaned harbour seals when the Wadden population had collapsed to a few hundred; it grew into a large rehabilitation and research operation, and its role has been argued over - the population recovered and critics questioned whether taking in healthy pups helped or hindered, so the centre has narrowed its intake and now emphasises research and release. Pieterburen is also the classic starting point for wadlopen, walking out across the exposed mudflats at low tide to a Wadden island or a sandbank and back or by boat - which is done only with a licensed guide, takes several hours in thigh-deep mud and water, and is genuinely dangerous alone, because the tide comes in faster than anyone can walk.

What you actually see

• A seal rehabilitation centre - founded in 1971, now narrowed to research and release.
• The wadlopen start - guided walks out across the tidal mudflats.
• The Wadden Sea - the UNESCO-listed intertidal system beyond the dyke.
• A working argument - whether intervention helps a recovered seal population.

When to go

April to October. A day.

Honest expectations

Do not walk onto the mudflats without a licensed guide - the tide fills the channels faster than you can walk and people have died. Walks are booked, physically hard and cancelled for weather. The seal centre is not a zoo.

Nearby

Lauwersoog and the Schiermonnikoog ferry are west; Groningen is south.