Caribbean Plate 1843 in this region are possibly megathrust earthquakes. Along the geologically complex southern boundary, the Caribbean Plate interacts with the South American Plate forming Barbados, Trinidad and Tobago (all on the Caribbean Plate), and islands off the coast of Venezuela (including the Leeward Antilles) and Colombia. This boundary is in part the result of transform faulting along with thrust faulting and some subduction. The rich Venezuelan petroleum fields possibly result from this complex plate interaction. The Caribbean plate is moving eastward about 22 millimeters per year in relation to the South American plate. In Venezuela much of the movement between
San Andrés (island) the sea route to visit the island is by cruise ships only (3–4 days journey). There are no passenger services to the island, though some cargo ships do carry a few passengers. The island also has a good network of paved lateral roads connecting the main circular road, which is of length. A tourist train (improvised tractor with coaches) also operates within the island. Boat services are also available within the island to visit various small towns and other locations of tourist interest along the coast line. San Andrés (island) Saint Andrew is a Colombian coral island in the Caribbean