The Delta of the Nile River
Surely, the Delta of the River Nile (the longest in the world with 6,650 kilometres) has been one of the most fought-over land in history. It all started in the year 450 of the Kingdom when the ancient Hellenic Republic stablished a colony in the Suez Istmus, which brought them to blows with Abalonia two centuries later when the Hellens tried to expand their colony completely disregarding the accord they had made with Abalonia. Abalonia would easily conquer the Suez Istmus, but lost terrain against the Aegyptian barbarians as the Kingdom of Betal-Dar attacked them from the East. By the time Abalonia reached again the possibility of taking the Nile again, the Kingdom of Tartessos and the Zulu Empire were also in the zone, ready to take control of the river. An accord reached between Abalonia and Tartessos gave each shore of the Lower Nile to each country, while the Zulu Empire had already taken the High Nile for themselves.
The place that was discussed much between Tartessos and Abalonia was the region of the Nile Delta, which didn't enter the accord (Tartessos would take the west shore and Abalonia the east shore) because, in that zone, the Nile is divided in two arms, making the definition of east and west shore difficult. In the end, Tartessos accepted to give the Delta to Abalonia in exchange of 1,000 pieces of gold, but the inhabitants of the zone rebelled against Abalonian rule and declared themselves part of the Kingdom of Tartessos (something that had also happened in the city of Corunia, which exchanged hands twice between Tartessos and the now-disappeared Kingdom of Florida before finally joining Tartessos after Florida cracked up and smashed itself in 12 different nations that nowadays make up the Floridean Federation). Abalonia would soon drop all attempts to expand into the zone, but they still rattled their sabers from time to time, like in the year...