marsh land meaning in English

沼泽地区

A preliminary analysis on ecoenvironmental issues and countermeasures of the old course and marsh land of huanghe in northem henan
豫北黄河故道湿地鸟类自然保护区鸟类区系调查
The game introduce : march forward in the underdeveloped mars surface , be a really a trifle difficulty , however trust , your trip machine also has a special material , can shoot bullet to bomb out to block the hillock that you go to road , as for marsh land you have to jump
游戏介绍：行进在未开发的火星表面，实在是有点难度，不过放心，你的旅行器也是装有特殊装备的，可以发射子弹炸掉挡你去路的山丘，至于洼地你得跳过去。