These are some ideas for flags of separatist and irredentist movements
Current governmental irredentist claims
editArgentina
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Falkland Islands/ Islas Malvinas
Bolivia
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Atacama Department/ Bolivia Pacific Ocean access
China
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Gorno-Badakhshan, Tajikistan
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Kachin, Burma
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Sagaing District, Sagaing, Burma
Comoros
editGuatemala
editIndia/Pakistan
editIsrael/Palestine
editPhilippines
editJapan
editRussia
editSpain
editSri Lanka
editVenezuela
editMajor non-governmental irredentist claims
editAlbania
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Presheva Valley, Serbia
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Albanians in Montenegro
Armenia
editIreland
editHistorical irredentist claims
editSomalia
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Somalis in Kenya
Morocco/ Mauritania
editEswatini (Swaziland)
editAssyrian homeland, Nineveh Plains
editAzerbaijan
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Derbent, Dagestan
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Borchali, Georgia
Bangladesh
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West Bengal
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Tripura
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Assam
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Rakhine, Burma
India - Indian Subcontinent
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Assam
Indonesia - Greater Indonesia
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East Timor
Iran - Pan-Iranian
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Dagestan
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Pashtunistan
Iraq
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Al-Hasa, Saudi Arabia
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Arabistan/ Ahwaz
Israel
editKorea
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Goguryeo - Manchuria
Mongolia
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Dzungaria/ Oirats
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Altai Republic