Diego Martin is a town in northwestern Trinidad, just north-west of the capital Port of Spain and east of Carenage. The Diego Martin Valley in the Northern Range was once filled with a number of small villages but is now a densely populated area. It was named after a Spanish explorer Don Diego Martín. The area was first settled by French planters and their slaves in the 1780s. It consists of a cluster of communities including Congo Village, Diamond Vale, Green Hill, Patna Village, Petit Valley, Blue Range, La Puerta Avenue, Four Roads, Rich Plain, River Estate, Blue Basin, Water Wheel, Gaza, Bhagatelle and Sierra Leone.