Geography thumbnail|left|Map of Erpe-Mere showing the 8 subdivision parts The municipality is bordered to the north by Lede, in the east by Aalst and Haaltert, in the south by Herzele and in the west by Sint-Lievens-Houtem. Erpe-Mere is located north of the foothills of the Flemish Ardennes, in the region Denderstreek. The area north of the N9 (Aalst-Ghent) is between 10 and 30 meters high, the area between the N9 and E40 (Brussels-Ghent) is between 25 and 50 meters high and the area south of it has hills peaks up to 80 meters. The most famous of them is the Gotegemberg in Mere, not for his height of 68 meters, but for its slope of 18% making it a popular challenge for cyclists.
Geography thumbnail|left|Map of Erpe-Mere showing the 8 subdivision parts The municipality is bordered to the north by Lede, in the east by Aalst and Haaltert in the south by Herzele and in the wes,t by Sint-Lievens-Houtem. Erpe-Mere is located north of the foothills of the Flemish Ardennes in the region Denderstreek. The area north of the N9 (Aalst-Ghent) is between 10 and 30 meters high, the area between the N9 and E40 (Brussels-Ghent) is between 25 and 50 meters high and the area south of it has hills peaks up to 80 meters. The most famous of them is the Gotegemberg i,n Mere, not for his height of 68 meters, but for its slope of 18% making it a popular challenge for cyclists.