Soi Sim Island is a naturally distinctive island in the central area of Ha Long Bay, approximately 12 kilometres from Tuan Chau International Passenger Port. Unlike the steep, rocky islets that dominate the bay, Soi Sim features forest-covered hills and a sandy beach, creating a varied landscape of greenery, limestone scenery and open water. The island covers a relatively small area and remains important for the conservation of Ha Long Bay’s terrestrial and marine ecosystems.

The island takes its name from the rose myrtle (sim), a flowering shrub that grows across its hillsides. From around May to August, the plants can produce vivid purple blossoms, adding seasonal colour to the landscape. This combination of native vegetation, forest trails and coastal scenery makes Soi Sim especially appealing to visitors interested in nature and photography.

Soi Sim Beach is one of the island’s main attractions, with a gently curving stretch of pale sand and clear water framed by green hills. When visitor access is permitted, the island can offer a quieter alternative to busier stops in Ha Long Bay. Walking paths and steps also provide opportunities to explore the island’s vegetation and enjoy elevated views of the surrounding limestone formations.

The island has traditionally been included on Ha Long Bay sightseeing Route 2, alongside attractions such as Ti Top Island, Sung Sot Cave and Luon Cave. However, access to Soi Sim Beach has been subject to conservation work and operational reviews. Official updates in June 2026 reported a temporary suspension of beach visits while authorities prepared for reopening. Visitors should therefore confirm the latest access arrangements before booking an itinerary that specifically includes the island.

For travellers exploring Ha Long Bay, Soi Sim represents the destination’s quieter, nature-focused side. Its appeal lies not only in its beach but also in its seasonal flowers, native vegetation and role in preserving the bay’s fragile environment.