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The pontoon-type VLFS platform rests on the water surface and is intended for deployment in calm waters such as a cove, a lagoon or a harbor. Its basic element is a simple box structure; it usually offers high stability, low manufacturing cost and easy maintenance and repair. The pontoon type is supported by its buoyancy on the sea surface. The pontoon type is flexible compared to other kinds of offshore structures, so that the elastic deformations are more important than their rigid body motions. Thus, hydroelastic analysis is uppermost in designing the pontoon-type VLFS. Together with the motion of the floating structure, the response of the structure to water waves and the impact on the entire fluid ___domain have to be studied.
Pontoon-type VLFS are also known in the literature as mat-like VLFS because of their small draft in relation to the length dimensions. {{anchor|Mega-Float}}Very large pontoon-type floating structures are often called '''Mega-Floats'''. As a rule, the Mega-Float is a floating structure having at least one length dimension greater than {{convert|60|m}} Horizontally large floating structures can be from {{convert|500|to|5000|m}} in length and {{convert|100|to|1000|m}} in width, with typical thickness of {{convert|2|to|10|m|ft}}.
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