How do you build the canton geography?

The affiliation to the canton is not geographic. All villages/municipalities with a majority belonging to a particular cultural/religious group will be affiliated with the canton labeled with this group.

Relevant Constitution Article

Article 22 : Delimitation of Federal and cantonal territory

1. The Federal Republic of Lebanon spans over 10,452km2 .
2. The federal territory is divided into four (4) cantons.
3. Each canton delineation is determined dependent of the municipalities that belong to the canton. cantonal geography and boundaries are determined and delineated by the aggregation of all municipalities belonging to the canton.
4. No geographical continuity is required for a municipality to be part of a canton.
5. Municipalities are allocated to a canton based on the following criteria:
   1. Municipal Territory as per current status at the time of this Basic Law’s enactment.
   2. Municipalities whose current voters (original inhabitants prior to the modification of the municipal voting laws) belong to the Group in a proportion exceeding 67% belong to the canton of such Group.
   3. Municipalities whose current voters (original inhabitants prior to the modification of the municipal voting laws) belong to the Group (Ethno-Cultural Group) in a proportion exceeding 51% and the remaining 49% is divided between several other Groups (i.e. not one block of 49% for another Ethno-Cultural Group) will be allocated to the canton of the cultural group holding majority.
   4. Municipalities with demographic configurations that differ from the ones mentioned above will determine a given dismemberment (per neighborhood) to ensure each portion of the municipality is properly re-delineated and each allocated to the proper canton.
6. Municipalities and cantons may be revised to ensure that each be of a size and capacity to perform its functions effectively. Due regard shall be given in this connection to regional, historical and cultural ties, economic efficiency, and the requirements of local and regional planning as well as the necessary governance tools commensurate with the empowerment of large Municipalities.