Map showing world base map shaded according to number of commissions to which countries belong.
 

Map showing global distribution of lake and river basin commissions.  The shading shows the number of commissions to which each country belongs.  Thus, Germany belongs to 10 commissions; South Africa to 7 commissions. Numerals also show the number of commissions to which countries belong. European Union and RAMSAR affiliations not counted.  Peters projection.
 

Maps showing continental base maps shaded according to number of commissions to which countries belong.
 

• Map showing European distribution of lake and river basin commissions.  The shading shows the number of commissions to which each country belongs.  Thus, Germany belongs to 10 commissions; South Africa to 7 commissions. Numerals also show the number of commissions to which countries belong. European Union and RAMSAR affiliations not counted.  Peters projection.

• Africa map; countries are shaded according to the number of basin commissions to which they belong.

• Nile Basin maps (source:  Digital Chart of the World).
• Nile Basin States;
• Perennial streams and water;
• Non-perennial (intermittent or ephemeral) streams and water;
• Perennial and ephemeral streams and water.
• Egypt (source:  Digital Chart of the World).
• Perennial streams and water;
• Non-perennial (intermittent or ephemeral) streams and water;
• Perennial and ephemeral streams and water.

Abstract maps.
A sequence of more abstract maps, based on point-level abstraction, line-level abstraction, and region-level abstraction, is presented below.  These maps may be useful for grasping global distribution pattern at a glance.

• The first map shows a more abstract map showing country centroids shaded according to number of lake and river basin commissions to which each belongs. The darker the color of the dot, the larger the number of commissions to which the nation belongs (from 1 to 10).


• The next map also uses centroids represented as circles of graduated size.

• Contouring of the centroids in the previous maps.

• Triangulated Irregular Network (TIN) based on the contours.  Digitized points on the contours are joined in a pattern of small triangles.  The facets of these triangles, when shaded suggest a picture with some depth.