evidence: They offered grateful devotions typical of a harvest festival but also asked for peace for their community amid what they see as an existential threat. Their village, Surama, is part of Guyana’s Essequibo region — a territory larger than Greece and rich in oil and minerals that Venezuela claims as its own and whose future it intends to decide Sunday with a referendum. The practical and legal implications of the vote, which among other things calls for turning Essequibo into a Venezuelan state, remain unclear, but the referendum has left area residents on edge. [...] The 61,600-square-mile (159,500-square-kilometer) area accounts for two-thirds of Guyana. Yet, Venezuela has always considered Essequibo as its own because the region was within its boundaries during the Spanish colonial period, and it has long disputed the border decided by international arbitrators in 1899, when Guyana was still a British colony.