|
Land Systems and Land Units
|
Physiographic
Region
|
Land System
|
Land
Form
|
Land
Unit
|
|
|
Terai
|
1
|
Active
alluvial plain (depositional)
|
1a.
|
Present river channel
|
32,500
(0.2%)
|
|
1b.
|
Sand and gravel bars
|
71,300
(0.5%)
|
|
1c.
|
Low terrace
|
30,000
(0.2%)
|
|
1d.
|
Higher terrace
|
94,400
(0.7%)
|
|
|
2
|
Recent
alluvial plain "lower piedmont" (depositional and
erosional)
|
2a.
|
Depressional
|
185,000
(1.3%)
|
|
2b.
|
Intermediate position, level
|
515,200
(3.5%)
|
|
2c.
|
Intermediate position, undulating
|
396,300
(2.7%)
|
|
2d.
|
High position
|
55,000
(0.4%)
|
|
|
3
|
Alluvial
fan, apron complex "upper piedmont" (erosional)
|
3a.
|
Very gentle slopes
|
271,900
(1.8%)
|
|
3b.
|
Gentle slopes
|
122,500
(0.8%)
|
|
3c.
|
Undulating
|
231,600
(1.6%)
|
|
3d.
|
Highly dissected
|
108,800
(0.7%)
|
|
Siwaliks
|
4
|
Active
and recent alluvial plains
|
4a.
|
Sand and gravel bars
|
65,100
(0.4%)
|
|
4b.
|
Low terrace
|
18,300
(0.1%)
|
|
4c.
|
Higher terrace, undulating
|
78,400
(0.5%)
|
|
4.
complex
|
|
2,000
(0.01%)
|
|
|
5
|
Fans,
aprons, and ancient river terraces
|
5a.
|
Very gentle slopes
|
89,100
(0.6%)
|
|
5b.
|
Gentle slopes
|
53,400
(0.4%)
|
|
5c.
|
Undulating topography
|
98,600
(0.7%)
|
|
5d.
|
Rolling topography
|
53,300
(0.4%)
|
|
5
complex
|
|
14,300
(0.1%)
|
|
|
6
|
Depositional
basins (Duns)
|
6a.
|
Depressional
|
14,000
(0.1%)
|
|
6b.
|
Non-dissected high position
|
16,000
(0.1%)
|
|
6c.
|
Gently rolling topography
|
18,900
(0.1%)
|
|
6d.
|
Highly
dissected
|
8,300
(0.07%)
|
|
|
7
|
Moderately
to steeply sloping hilly and mountainous terrain
|
7
|
-
|
88,800
(0.6%)
|
|
|
8
|
Steeply
to very steeply sloping hilly and mountainous terrain
|
8
|
-
|
1,260,500
(8.5%)
|
|
Middle Mountains
|
9
|
Alluvial
plains and fans (depositional)
|
9a.
|
River channel
|
37,400
(0.3%)
|
|
9b.
|
Alluvial plains
|
31,200
(0.2%)
|
|
9c.
|
Alluvial fans
|
28,300
(0.2%)
|
|
9
complex
|
|
38,100
(0.3%)
|
|
|
10
|
Ancient
lakes and river terraces (Tars) (erosional)
|
10a.
|
Non-dissected
|
43,900
(0.3%)
|
|
10b.
|
Dissected
|
28,800
(0.2%)
|
|
10
complex
|
|
50,900
(0.3%)
|
|
|
11
|
Moderately
to steeply sloping mountainous terrain
|
11.
|
-
|
1,853,600
(12.6%)
|
|
|
12
|
Steeply
to very steeply sloping mountainous terrain
|
12.
|
-
|
2,236,400
(15.2%)
|
|
High
Mountains
|
13
|
Alluvial
plains and fans
|
13a.
|
Active alluvial plain
|
32,400
(0.2%)
(including
13a, 13b, 13c, 13d, and 13complex)
|
|
13b.
|
Recent alluvial plain
|
|
13c.
|
Fans
|
|
13d.
|
Ancient alluvial terraces
|
|
|
14
|
Past
glaciated mountainous terrain below upper altitudinal limit of
arable agriculture
|
14a.
|
Moderate to steep slopes
|
464,600
(3.2%)
|
|
14b.
|
Steep to very steep slopes
|
1,006,800
(6.8%)
|
|
|
15
|
Past
glaciated mountainous terrain above upper altitudinal limit of
arable agriculture
|
15a.
|
Moderate to steep slopes
|
286,400
(1.9%)
|
|
15b.
|
Steep to very steep slopes
|
1,109,300
(7.5%)
|
|
High Himal
|
16
|
Alluvial,
colluvial and morainal depositional surfaces
|
16a.
|
Glacio-alluvial plains
|
834,000
(3.2%)
(including
16a, 16b, 16c, 16d, and 16complex)
|
|
16b.
|
Morainal deposits
|
|
16c.
|
|
Nepal