Lan Ha Bay sits quietly to the south of Cat Ba Island, a sheltered curve of emerald water dotted with hundreds of limestone islets, hidden lagoons and pocket-sized beaches.

Geographically it’s part of the wider Ha Long–Cat Ba archipelago, but it falls under Hai Phong’s management, which—together with tighter cruising permits—helps keep boat traffic lighter and the atmosphere notably calmer. The result is the same jaw-dropping scenery as Ha Long Bay, with fewer horns, fewer party boats and more space to simply glide and take it in.

This is a bay made for gentle adventure. Kayaks slip through low arches into still, jade-coloured pools where kingfishers skim the surface; at low tide you can nose up to tiny crescents of sand such as Ba Trai Dao (Three Peaches). The water here is typically clearer than in Ha Long, so summer swims and the occasional snorkel over coral patches are part of the appeal.

On land, a short speedboat ride brings you to Cat Ba National Park for easy ridge walks and island views, while cycling to Viet Hai village offers a window onto rural island life. You’ll still see classic northern seascapes—floating fishing houses, pearl farms, the steel ribbon of Cat Ba Bridge—but with long, quiet stretches between them.

Cruises tend to be on smaller, well-kept vessels with more attentive service, anchoring overnight in protected coves where the night sky feels properly dark. Access from Hanoi is straightforward: expressway to Got Pier (about 2–2½ hours), then a quick ferry or speedboat to meet your cruise or continue to Cat Ba Town. The best weather runs October to May; June to September is warmer with brief showers—ideal for swimming and kayaking.

In short, Lan Ha Bay delivers Ha Long Bay’s iconic karst scenery with a softer footprint and a calmer rhythm—often the better choice for travellers who value serenity alongside spectacular views.