The Tournaisis is the name given to the area of Tournai, in Belgium.

The Encyclopedia of Diderot and D' Alembert (1751 - 1772) defines it as follows:

TOURNESIS, it, (Géog. MOD.) small country of Flanders, & which takes its name of Tournay its capitale.

Le Tournesis is other thing only the châtellenie of Tournay, which is of a rather great extent; because it contains approximately fifty villages or boroughs, whose justice arose with the provincial council of Flanders, from where one can call at the Parliament of Malines.

Les kings de France having instituted the bailliage of Vermandois, swages there joint Tournai & Tournesis; but in 1383 Charles VI. set up a bailliage with Tournay, to which it subjected this city & Tournesis, with the grounds of Mortagne & Saint - Amand, which relevoient bailliage of Vermandois before; the union of these grounds to this bailliage lasted until the tems of the peace of Utrecht, by which all ground of Saint - Amand was separated from the bailliage of Tournesis, & grant to France; but for the nine villages which dépendoient of Mortagne, they were left at the house of Autriche.

See too

Province of Tournaisis