Dota map

Three lanes connect the two opposing bases. The middle lane (often referred to as mid), runs straight through the centre of the battlefield. The other two side lanes run along the edges and are known as the top and bottom(or bot) lanes. Given that the map is square, the side lanes are roughly √2 ≈ 41% longer than mid. The towers are also placed differently, as can be seen here. The sentinel (red) bottom and scourge (green) top lanes have towers placed much further than their respective lanes. Due to this, it is much safer in these lanes.