The Colony of Demerara-Essequibo was created on 28 April 1812, when the British combined the colonies of Demerara and Essequibo into the colony of Demerara-Essequibo.
ðə kˈɑːləni ʌv dˌɛmɚɹˈɑːɹɹəˌɛsɪkwˈiːboʊ wʌz kɹiːˈeɪɾᵻd ˌɔn twˈɛnti ˈeɪt ˈeɪpɹəl wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd twˈɛlv, wˌɛn ðə bɹˈɪɾɪʃ kəmbˈaɪnd ðə kˈɑːləniz ʌv dˌɛmɚɹˈɑːɹɹə ænd ˌɛsɪkwˈiːboʊ ˌɪntʊ ðə kˈɑːləni ʌv dˌɛmɚɹˈɑːɹɹəˌɛsɪkwˈiːboʊ.