Turin King List presents the name of the Pharaoh Nehesy in a group, which is usually associated with the 14th dynasty and of which capital was – according to Manetho – Chois in the western delta. Nehesy was a high offical, who gained a position of King in Avaris for a short period (the exact lenght of his reign is not known, but he probably ruled for 3 years).
Nehesy was likely an Egyptian or maybe a Nubian (which is literal meaning of his name). The King, whom Nehesy originally served, might continue his reign in Itjtawy near Lisht, which was abandoned after 1,685 BC, but the last really powerful King of the 13th dynasty was Sobekhotep IV. It is likely that the unity of the land began to fall apart after Sobekhotep's reign.
If we want to define the authority of Nehesy (or its range more exactly) through localities, where his name appeared, it is the area of eastern delta from Tell el-Mukdam to Tell Habwe. But the area of his influence could be much smaller, because the only sights found on original places come from Tell Habwe and Tell el-Dab'a.