LETICIA, Colombia — The jungle town of Leticia provides Colombia's only access to the Amazon River. But as the river changes course the town could soon be left high and dry and that's fueling a border dispute with neighboring Peru.

Drought, sedimentation and meandering by the world's second largest river are gradually pushing the waterway farther south into Peru and away from Colombia. A Colombian Navy study predicts that within five years, Letica could be landlocked.

Alarmed residents point out that, although Leticia has an airport, there are no highways connecting this town of 55,000 people at the southern-most tip of Colombia to any other region of the country. Most food and other supplies arrive here via Amazon River boats from Peru and Brazil.

"We depend on daily trade between t

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