Border? It is on the southern US border.
Belarus.
It is the southern border for Texas; conversely, it is the northern border for Mexico.
No. Northern Switzerland ans southern Germany border each other.
No. Lebanon is on Israel's northern border or Israel is on Lebanon's southern border. There are areas of Israel that are further north of some areas of Lebanon. But this is similar to how some areas of Mexico are north of some places in the US, and some areas in Canada are south of some places in the US. Similarly, the border between Lebanon and Israel is uneven, and does not follow a line of constant latitude.
696,970 mi
310 miles
Northern border is Canada Southern border is Mexico
300 miles
211 miles
Lebanon
211 miles