Donkere Bos, Badhuiskuil and Terschelling Loop

You’ll be walking a classic slice of west Terschelling: low, wind-shaped dunes, damp dune slacks, and the island’s darker conifer woods—almost entirely flat underfoot (around 21 km / 13.0 mi with roughly 0 m / 0 ft of climbing), but with constant micro-undulations in the sand and plenty of exposure to coastal wind.

For a practical start point that matches the Donkere Bos + Badhuiskuil area, aim for the main beach access at West aan Zee (Badweg, West aan Zee, Terschelling) near the Paal 8 / Badweg parking area and beach facilities. (terschelling.org)

Getting to the start (car + public transport)

• By car (from mainland Netherlands): Drive to Harlingen for the ferry to West-Terschelling. If you’re bringing a car across, you’ll arrive at the island’s main port and then drive ~10 minutes to Badweg / West aan Zee for the beach parking. If you’re not taking the car over, long-stay parking options are available near the Harlingen ferry terminal area (often best arranged ahead in busy periods). (terschelling.org)
  
• By public transport: Take the ferry to West-Terschelling and then use island buses/taxis toward West aan Zee / Badweg (or walk/cycle if you’ve rented a bike near the harbor). A lot of Terschelling routes are designed around easy connections from West-Terschelling. (wandelzoekpagina.nl)

What the terrain feels like (and what to wear)

Expect a mix of: - Firm cycle paths and sandy footpaths through dunes - Needle-covered forest tracks in Donkere Bos - Wet, peaty patches in dune valleys (especially after rain or in winter)

Even with “0 m” of gain overall, sand walking can feel slower than the distance suggests. Bring windproof layers year-round; on an open island, wind is often the biggest “difficulty multiplier.”

The walk: dunes → Badhuiskuil → Donkere Bos → back to the coast

From the West aan Zee side, you’ll quickly leave the beach atmosphere and slip into dune country. The first few kilometers (roughly 3–5 km / 1.9–3.1 mi) are typically the most open: low dune ridges, marram grass, and wide skies. In clear weather you’ll get frequent glimpses of the North Sea side, and you’ll feel the salt air immediately.

Around 6–9 km / 3.7–5.6 mi in (depending on your exact line), you’ll reach the Badhuiskuil area—one of the most distinctive “small” landmarks on this loop. It’s a restored wet dune valley with a pond and a viewpoint, and it’s also tied to Dutch nature science and restoration history: there’s a monument to Prof. Dr. Victor Westhoff (1916–2001) nearby, and the site is noted as an early proving ground for nature restoration work; Staatsbosbeheer restoration in 1989 helped rare dune-slack plants return (including species such as shoreweed and thread gentian). (terschelling.org)
What to look for here: - A clear transition from dry dune to lush, moisture-loving vegetation - Soggy margins and soft ground near the water (easy to step off-trail into mud if you’re not watching foot placement)

From Badhuiskuil you’ll arc inland into Donkere Bos for the middle portion of the loop (often 7–10 km / 4.3–6.2 mi of your day, depending on routing). Donkere Bos is a substantial forest north of West-Terschelling, crisscrossed by walking and cycling trails. It’s known as a strong spot for forest birds—