That's right, it isn't.
Doesn't exist as a country.
It's part of Syria at that time*.
And even the Arabs claimed so, that 'Palestine' is actually Syria, in 1921.
Who they kidding?
From their report's recommendations:
B. We recommend, in the second, that the unity of Syria be preserved, in accordance with the earnest petition of the great majority of the people of Syria...(3) The precise boundaries of Syria should be determined by a special commission on boundaries, after the Syrian territory has been in general allotted...Moreover, there would be less danger of a reactionary Moslem attitude, if Christians were present in the State in considerable numbers, rather than largely segregated outside the State, as experience of the relations of different religious faiths in India suggest. As a predominantly Christian country it is also to be noted that Lebanon would be in a position to exert a stronger and more helpful influence if she were within the Syrian State, feeling its problems and needs, and sharing all its life, instead of outside it, absorbed simply in her own narrow concerns. For the sake of the larger interests, both of Lebanon and of Syria, then, the unity of Syria is to be urged. It is certain that many of the more thoughtful Lebanese themselves hold this view. A similar statement might be made for Palestine; though, as the Holy Land for Jews and Christians and Moslems alike, its situation is unique, and might more readily justify unique treatment, if such treatment were justified anywhere. This will be discussed more particularly in connexion with the recommendation concerning Zionism...
...We recommend, in the fifth place, serious modification of the extreme Zionist programme for Palestine of unlimited immigration of Jews, looking finally to making Palestine distinctly a Jewish state...
...(3) The Commission recognised also that definite encouragement had been given to the Zionists by the Allies in Mr. Balfour's often quoted statement, in its approval by other representatives of the Allies. If, however, the strict terms of the Balfour Statement are adhered to-favouring "the establishment in Palestine of a national home for the Jewish people," "it being clearly understood that nothing shall be done which may prejudice the civil and religious rights of existing non-Jewish communities in Palestine" - it can hardly be doubted that the extreme Zionist programme must be greatly modified. For a national home for the Jewish people is not equivalent to making Palestine into a Jewish State; nor can the erection of such a Jewish State be accomplished without the gravest trespass upon the civil and religious rights of existing non-Jewish communities in Palestine. The fact came out repeatedly in the Commission's conferences with Jewish representatives, that the Zionists looked forward to a practically complete disposition of the present non-Jewish inhabitants of Palestine, by various forms of purchase...
...No British officer, consulted by the Commissioners, believed that the Zionist programme could be carried out except by force of arms. The officers generally thought that a force of not less than 50,000 soldiers would be required even to initiate the programme...the initial claim, often submitted by Zionist representatives, that they have a "right" to Palestine based on an occupation of 2,000 years ago, can hardly be seriously considered.
There is a further consideration that cannot justly be...it may be doubted whether the Jews could possibly seem to either Christians or Moslems proper guardians of the holy places, or custodians of the Holy Land as a whole. The reason is this: The places which are most sacred to Christians those having to do with Jesus-and which are also sacred to Moslems, are not only not sacred to Jews, but abhorrent to them. It is simply impossible, under those circumstances, for Moslems and Christians to feel satisfied to have these places in Jewish hands, or under the custody of Jews. There are still other places about which Moslems must have the same feeling. In fact, from this point of view, the Moslems, just because the sacred places of all three religions are, sacred to them, have made very naturally much more satisfactory custodians of the holy places than the Jews could be...
...There would then be no reason why Palestine could not be included in a united Syrian State, just as other portions of the country, the holy places being cared for by an international and inter-religious commission, somewhat as at present under the oversight and approval of the Mandatory and of the League of Nations. The Jews, of course, would have representation upon this Commission.
The recommendations now made lead naturally to the necessity of recommending what power shall undertake the single Mandate for all Syria.