Migrants, employed in Costa Rica as seasonal laborers, typically work long hours and live in cramped housing that make them more vulnerable to disease.
More than 60,000 people have fled the crisis in Nicaragua over the past year, the UN said Tuesday, with neighboring Costa Rica bearing the brunt of the refugee flow.
In February, the International Court of Justice ruled Costa Rica has sovereignty over the “whole northern part of Isla Portillos, including the coast,” but excluding Harbour Head Lagoon.
Nicaragua's arguments in the border dispute include a map of Costa Rica without the Nicoya peninsula, claiming that the maritime limits disputed before the ICJ should not take that territory into account.
Nicaragua will have until June 2 to submit a response. Justices then will issue a final ruling on the damage compensation figure and on a deadline to make the payment.
Costa Rica asked the International Court of Justice to add a new complaint against Nicaragua to an ongoing case of a border dispute first filed in 2014.
The deadline for Costa Rica and Nicaragua to reach an agreement on the payment of compensation over environmental damage ruled by the International Court of Justice (ICJ) ended Friday without any signs of a settlement.