| Subunit |
Description |
| Cordones2, or small
ranges (cordilheiras 3) |
Positive relief forms, narrow and elongated, protruding
slightly above the level of the surrounding terrain. Their
shape and location suggests that they may be relics of a much
more active geodynamical past. |
| Channels with permanent runoff |
Negative relief forms of sizable depth, with permanent
or quasi-permanent runoff, such as the major and minor rivers
of the Pantanal. |
| Channels with temporary runoff
(corregos, or corixos3) |
Negative relief forms, shallow and more or less narrow,
with temporary (intermittent) runoff. |
| Streambeds with temporary runoff
(vazantes3) |
Negative forms of relief, slightly concave and quite wide
and shallow, with relatively mild longitudinal slopes. |
| Depressed plains |
Generally flat and of negligible relief, typically occupying
interfluvial locations and subject to more-or-less seasonal
inundation. |
| Flooded plains |
Positive forms of relief which are subject to seasonal
inundation from neighboring channels.
|
| Diffuse flooded plains |
Flooded plains where runoff lacks a clear direction. |
| Composite flooded plains |
Flooded plains where runoff may or may not have a clear
direction. Typical of this subunit is the runoff of the lower
courses of the Cassange, Alegre, Caracará, and Cuiabá rivers,
right-bank tributaries of the Upper Paraguay river (downstream
of Bela Vista do Norte and upstream of Amolar). |
| Lagoons (baías3) |
Negative forms of relief, sometimes of sharp concavity,
which may be permanently or temporarily filled with water;
saline at times. The greatest density of this subunit is found
in the area of Nhecôlandia. |
| Isolated hills (inselberg,
or island hills) |
Extremely positive relief forms, associated with underlying
Precambrian and Cambrian rocks, and occupying relatively
small areas within the Pantanal depression. Examples are the
Ilha de Ínsua, Morro do Conselho, Morro de Coimbra, and Fecho
dos Morros. |