This section details the characteristics of the physical environment, both on land and within
Myanmar’s maritime limits, from its depth zones to seabed slope and undersea features that
are regionally important.
Submerged edge of the continents; pale blue polygon.
(a) (ii) Continental slope
Relatively steep slope from the offshore border of the continental shelf to the rise from the abyssal plain; green polygon.
(a) (iii) Abyssal plain
Flat area of the ocean-basin floor with a slope of less than 1:1000; dark blue polygon.
(b) Abyssal plain
Classified as hills (low relief feature of the ocean floor ranging up to several hundred metres in height and several kilometres in diameter, mid blue polygon), mountains (usually conical in shape protruding at least 1,000 m above the ocean floor, pale blue polygon) and plains (flat or gently sloping areas of ocean floor, dark blue polygon).
(c) Continental shelf relief
Classified as low relief (pale yellow polygon), medium relief (orange polygon), high relief (brown polygon), and shelf valleys (relatively shallow, wide depressions with gentle slopes, the bottom of which grades continually downward, (dark purple polygon).
(d) Undersea features
Including escarpments (elongated and comparatively steep slopes separating flat or gently sloping areas of the ocean floor, dark blue polygon), canyons (narrow, deep depressions with steep slopes, turquoise polygon), ridges (long, narrow elevations of the ocean floor with steep sides, blue-green polygon), terraces (narrow coastal strips sloping gently seaward consisting of loose sediment or rock, dark green polygon) and basins (depressions of variable extent, generally in a circular or oval form, pale green polygon).
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