Last year, as Costa Rica and Nicaragua fought over a small piece of land, one of the issues was over how the Rio San Juan has moved over the past 100-150 years. If the river moves, does the border move too?
Rivers move a great deal over the course of decades, more than most other natural boundaries (like mountains). When boundaries are set by natural geography at a certain moment in time, the risk is that they will move in the future.
The river moving in Central America was one factor setting off a dispute. Are there other border disputes that could arise over similar natural events in the coming century?
While I don't think many mountains will be moving much (the Chile/Argentine border is defined by mountain peaks), it may be maritime boundaries are the big issue. Rising sea levels are likely to change shape of borders as they hit the sea, which can affect rights on fishing and deepsea oil drilling.
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