How many nautical miles is it from Haikou to Zhanjiang?

Haikou's nearest place to the mainland is Hai 'an County, Zhanjiang, Guangdong Province, and Qiongzhou Strait, 26 kilometers away from Hai 'an and Haikou. It takes only one hour to get to Haikou by ro-ro ship from haian port. When the weather is clear, you can see each other when you stand high by the sea. Due to the complicated water flow in Qiongzhou Strait, no cross-sea bridge has been built so far. Except airplanes, trains and cars can only cross the sea by ferry from Zhanjiang H.