In French 'Tripes' refers to both stomach (of cow) and chitterlings (lower intestines of pigs). The stomach is what we would recognize as tripe in the UK, and is used in classic French dishes such as 'Tripe de mode de Caen'.
When you see 'Tripes' (Vette Darme) on the menu in Flanders, it often refers to pan fried Chitterlings, which as one would imagine, can be an acquired taste.
They are normally served with salad and chips.
You can buy them loose at many butchers in the region, and they are particularly delicious when cooked on a barbecue.