Floating element for realizing floating structures for supporting photovoltaic panels, comprising: a first element which can be obtained by injection moulding, which configures a first coupling portion; a second element which can be obtained by injection moulding, which configures a second coupling portion; the first element and the second element being mutually configured so that the first coupling portion and the second coupling portion can be seal-coupled with respect to each other so that they define a sealed chamber, when coupled: connection means for connecting the floating element to another floating element; the connection means comprising: a first connection element integral to the second element, the first connection element comprising a first tongue, which comprises a first through hole; a second connection means integral to the first element, the second connection element comprising a second tongue developing from the first element and which comprises a second through hole; the first tongue and the second tongue being mutually arranged so that, when the first element and the second element are coupled, the first through hole is opposed to the second through hole; the floating element being characterized in that: the first connection element comprises a first portion developing from the second element; the first tongue develops from the first portion; the first element comprises a first groove which is shaped complementarily to the first portion of the first connection element and which is arranged so that, when the first element and the second element are coupled, the first groove receives the first portion and they result in form-coupling. a first element which can be obtained by injection moulding, which configures a first coupling portion; a second element which can be obtained by injection moulding, which configures a second coupling portion; the first element and the second element being mutually configured so that the first coupling portion and the second coupling portion can be seal-coupled with respect to each other so that they define a sealed chamber, when coupled: connection means for connecting the floating element to another floating element; the connection means comprising: a first connection element integral to the second element, the first connection element comprising a first tongue, which comprises a first through hole; a second connection means integral to the first element, the second connection element comprising a second tongue developing from the first element and which comprises a second through hole; the first tongue and the second tongue being mutually arranged so that, when the first element and the second element are coupled, the first through hole is opposed to the second through hole; the floating element being characterized in that: the first connection element comprises a first portion developing from the second element; the first tongue develops from the first portion; the first element comprises a first groove which is shaped complementarily to the first portion of the first connection element and which is arranged so that, when the first element and the second element are coupled, the first groove receives the first portion and they result in form-coupling. connection means for connecting the floating element to another floating element; the connection means comprising: a first connection element integral to the second element, the first connection element comprising a first tongue, which comprises a first through hole; a second connection means integral to the first element, the second connection element comprising a second tongue developing from the first element and which comprises a second through hole; the first tongue and the second tongue being mutually arranged so that, when the first element and the second element are coupled, the first through hole is opposed to the second through hole; the floating element being characterized in that: the first connection element comprises a first portion developing from the second element; the first tongue develops from the first portion; the first element comprises a first groove which is shaped complementarily to the first portion of the first connection element and which is arranged so that, when the first element and the second element are coupled, the first groove receives the first portion and they result in form-coupling. the first connection element comprises a first portion developing from the second element; the first tongue develops from the first portion; the first element comprises a first groove which is shaped complementarily to the first portion of the first connection element and which is arranged so that, when the first element and the second element are coupled, the first groove receives the first portion and they result in form-coupling.