South of the international boundary the route traverses an uneven terrain formed by mighty glaciers as they retreated across the region during the ice age. It passes Devils and Arrowood Lakes and crosses the pleasant wooded valleys of the Sheyenne and James Rivers. Between the groves and farmhouses along the way are thousands of acres of open fields and grasslands. Brown and black in spring, these soon turn green with the crops of wheat, oats, barley, corn, and cultivated grasses grown in this diversified farming area. The southern part of the route passes through some of the best pheasant-hunting country in the State, while grouse and duck are also plentiful. ND 4 crosses the Canadian boundary, =0.0 m.=, 8 m. S. of Cartwright, Man., Canada. HANSBORO, =3 m.= (1,595 alt., 176 pop.), is named for Henry Clay Hansbrough, the first Representative (1889-91) sent to Congress from North Dakota, and later U. S. Senator (1891-1909). The town is a port of entry, and the U. S. customhouse is here. At =15 m.= is the junction with ND 5 (_see Tour 5_), a graveled highway, which between this point and =20 m.= is identical with ND 4. ROCK LAKE, =21 m.= (1,548 alt., 279 pop.), is on the southern end of the long, narrow, fresh-water lake of the same name. The U. S. Biological Survey has created a migratory waterfowl sanctuary by constructing a large, earthfill dam on the lake just NE. of town. Overflow from the water impounded will be sufficient to raise the levels of a number of smaller lakes in the area. At Rock Lake is a junction (L) with ND 5 (_see Tour 5_). At =35 m.= is a junction with a county road. Left on this road to SNYDER LAKE, =3 m.=, a recreational center (_swimming and picnicking facilities_). CANDO, =44.5 m.= (1,486 alt., 1,164 pop.), received its name at a county commissioners' meeting in 1884, when, during the heat of an argument over the selection of the Towner County seat, P. P. Parker, chairman of the board, called out above the confusion, "There has been much talk about our not having power to locate this county seat where we see fit. But we'll show you that we can do it. And furthermore, just to show you what we can do, we'll name this county seat 'Can-do.'"