Nicaragua runs under a unitary presidential constitutional republic, and has had their current constitution since 1987. Out of a total of 88 constellations found in the night sky, 86 of them can be seen clearly in Nicaragua. The Pacific coastal region of Nicaragua celebrates many religious festivals, and utilizes music and dance to celebrate. The only freshwater sharks known in the world can be found in Lake Nicaragua. There are no street names in Nicaragua. A person's address is given by whatever major landmarks they live near.