धन्वदुर्गं महीदुर्गमब्दुर्गं वार्क्षमेव वा । नृदुर्गं गिरिदुर्गं वा समाश्रित्य वसेत् पुरम् ॥ ७० ॥
Let him build (there) a town, making for his safety a fortress, protected by a desert, or a fortress built of (stone and) earth, or one protected by water or trees, or one (formed by an encampment of armed) men or a hill-fort.