• Trunk Bay Beach, considered one of the 10 best beaches in the world is home to the underwater trail.

    Virgin Islands

    National Park Virgin Islands

Marine Plants / Algae

Thalassia testudinum (Turtle grass) flower

Thalassia testudinum flower

Dr. Caroline Rogers

Seagrasses are true flowering plants that live underwater. They live in shallow, clear water, allowing enough light for them to photosynthesize, just like land plants. They spread primarily through the growth of roots and rhizomes, often forming large meadows in sandy or muddy substrate. These root systems help stabilize sediment and reduce shoreline erosion.

Boat anchors and propellers cause great damage to seagrass beds. Anchors can rip out the roots and gouge holes that undermine the surrounding root systems. The area "implodes," and it may take years for these areas to recover, if they recover at all.

Never Anchor in Seagrass or Coral

Did You Know?

visitor gets a little closer to one of the underwater trail signs in Trunk Bay.

The underwater snorkel trail at Trunk Bay is an excellent place for beginners or anyone wanting to learn about marine life. Plaques along the trail describe the various species of fish, and provide information about the coral reefs.