ParametricRegion

ParametricRegion[{f1, ..., fn}, {u1, ..., um}] represents a region given by parametric functions.

Examples

Circle as parametric region:

reg = ParametricRegion[{Cos[t], Sin[t]}, {{t, 0, 2 Pi}}];
RegionPlot[reg]

Parametric surface:

ParametricRegion[{u Cos[v], u Sin[v], u}, {{u, 0, 1}, {v, 0, 2 Pi}}]

Please visit the official Wolfram Language Reference for more details.