Waters
When it gets to Patlageanca with 6400 m³ per second (on an average), the Danube forms two arms: Chilia to the North and Tulcea to the South and the latter at Ceatalul Ismail is divided into Sulina and Sfantu Gheorghe.
The main water courses are the four arms through which the Danube flows into the sea.
CHILIA - the northernmost and most active arm, with two groups of branches and a micro-delta of its own. Length: 105 km up to Periprava; maximum width: 1.000 m; maximum depth: 39 m. It carries around 60% of all river water; sinuousness coefficient: 1,56. Local shipping.
TULCEA - an arm running between the streches of the land Chilia and Sf. Gheorghe (on the left bank, Tulcea town). Length: 19 km; maximum width: 300 m; maximum depth: 34 m. It carries about 40% of the river water; sinuousness coefficient: 1,40. Man shipping way.
SULINA - the shortest, straightest and most developed arm. Length: 64 km; maximum width: 250 m; maximum depth: 18 m. It carries about 22% of the river water; sinuousness coefficient: 1,03. River-maritime traffic channel (7.000 ton ships may sail where the arm is at least 7.32 m deep).
SFANTU GHEORGHE - the oldest arm through which the Danube flows into the sea. Length: 64 km; maximum width: 550 m; maximum depth: 26 m. It carries about 22% of the river water; sinuousness coefficient: 1,60. Local shipping. The secondary hydrographic network of the Danube Delta generally has four components: creeks (former arms of the Danube, which are getting clogged), backwaters (smaller creeks), channels (rectified and dredged), periboinas (litoral loopholes where water is exchanged). Besides, there are also simple formations of a depression-lacustrine nature: marshes (0.50-3 m deep), estuaries (by the mouth of rivulets), lagoons (old marine gulfs), swamps (low water that may vanish), japsas (pools left by high waters), as well as complex ones: depression lakes (Padina, Sontea, Furtuna, Dranov, Matita, Obretin etc.). The Delta hydrographic basin also comprises the corresponding litoral line, the maritime zone along the coast, 10-15 km wide, less than 25 m deep, influenced by the flow of the sweet water.

Danube Delta...
Tulcea
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