 सग्राहा स्सरितश्चैव पङ्कवत्यस्सु दुस्तराः। मत्तैरपि गजैर्नित्यमतो दुःखतरं वनम्।। 
  The rivers, infested with crocodiles and filled with mud are difficult to cross even for elephants in rut. Hence forest life is always extremely dangerous.  