The boroughs of new york city are an example of boundaries.

The boroughs of New York City are examples of INTRA-CITY boundaries.
A borough refers to an administrative division that are used in various English countries. The New York City have five boroughs, they are Manhattan, state Island, Queens, the Bronx and Brooklyln. These borough are described as intracity because, they divide the state of New York into five different counties. 

Answer volcanic outgassing;

Answerequatorial guinea,gabon, and western sahara;