ɐ pˈɑːnd lˈaɪnɚɹ ɪz ɐn ɪmpˈɜːməbəl dʒˌiːoʊmˈɛmbɹeɪn jˈuːzd fɔːɹ ɹᵻtˈɛnʃən ʌv lˈɪkwɪdz, ɪŋklˈuːdɪŋ ðə lˈaɪnɪŋ ʌv ɹˈɛzɚvwˌɑːɹz, ɹᵻtˈɛnʃən bˈeɪsənz, hˈæzɚdəs ænd nˌɑːnhˈæzɚdəs sˈɜːfɪs ɪmpˈaʊndmənts, ɡˈɑːɹdən pˈɑːndz ænd ˌɑːɹɾɪfˈɪʃəl stɹˈiːmz ɪn pˈɑːɹks ænd ɡˈɑːɹdənz.
A pond liner is an impermeable geomembrane used for  retention of liquids, including the lining of reservoirs, retention basins, hazardous and nonhazardous surface impoundments, garden ponds and artificial streams in parks and gardens.