求翻译：观海长廊工程南起海淀路北至海洋路，全长约1.7公里，根据其地形现状分为南、中、北三个区，以紫荆广场居中，两翼园道收分有致，曲弯自如。南区的绿化品种繁多，有乔木、灌木及地被三层。是什么意思？

View the sea promenade South Haidian Road North to ocean, about 1.7 km in length, according to the present situation of its terrain is divided into three districts, North and South, to Bauhinia Square Center, wings Park Road collection run, curved bends freely. Green variety in the Southern District, there are three layers of trees, shrubs and ground cover.