sentences:  However, architectural remains extend beyond this central zone to the edges of the northern and southern swamps, a distance of approximately .The plateau on which the ruins are situated is not broken by abrupt changes in altitude but rather presents a smoothly contoured elevation.The layout of the site is centred on a north-south axis centred on the causeway; in general the plan of the site is similar to that of Ixkun on the Dolores Plateau in the southern Petén.