(sophie fouron) cartagena. located on the northern coast of columbia, it sits at the heart of a beautiful bay that opens onto the caribbean sea. the city was initially spread out on five islands isolated from the mainland by marshes and lagoons. (francisco arias-isaza) we have major challenges. the landscape is so close to sea level that very little sea level rise will bring huge, huge problems to the city. - coveted since the dawn of time for its convenient location, it is now undergoing major changes. initially built within these walls, it is now expanding at an incredible pace. but the growth is pushing carthaginianswa