The Amaseikumor festival is a revered heritage 7-day festival celebrated annually by the Ijaws in Gbaramatu Kingdom, Warri South West Local Government Area of Delta State, Nigeria. Amaseikumor, an Ijaw word, means "do not pollute the land”. Amaseikumor festival can be traced back to about 14 AD. Ijaw ancestors have a covenant of truth (Izon-Gesi). This covenant is regularly reaffirmed with the Amaseikumor festival, which emphasizes the confession of sin, eradication of negative behaviours, and commitment to righteous living.

The Ijaw people are the bearers and practitioners of Amaseikumor festival. The priestess of Okonoweibou-Esinghan leads the women to participate in Ibolomoboere feast and worship Ibolomoboere Ziba-Opuoru goddess which is believed to bless women in their endeavours and grant them the fruit of the womb. The women and men participate in processions and rituals, while the youths often set up the festival grounds and participate in dances and games. 

The Chief Priest leads the prayers and rituals of cleansing where children are allowed to observe. The elders teach the younger generation about the significance of the festival and the traditions to uphold. The high priest is known as Kariwei, who is assisted by the Wurutuawei, who serve him (drink) local Ogorogoro for prayers at every ritual to the ancestors of the land, and to bless humanity.

Those to partake in the festival usually dressed in white regalia are forbidden from engaging in certain acts that are considered spiritually defiling such as abstaining from sex two days to the festival and throughout the period of the festival.

The festival kicks off on day-one with Ibolomoboere Ziba-Opuoru deity as the mother of Creation Woyein who intercedes on behalf of her children through rituals by going to the river to pray and libations to the water goddess, followed religiously with Opuadewe rituals by praying with local gins at the ancestral house of the ancestors. The eve of the day accompanied with killing of animals at the sanctuary or temple of Ibolomoboere deity, then the day-three days of Gbaruan Egbesu, the god of war and justice. Freedom, liberty and peace with both men and women procession called in Ijaw dialect as (Ogele) singing, dancing and beautiful masquerade display at every interval with a purification ceremony, and dedication to the spiritual protection of the community. This is followed by Ibolomobo-ere, a salutation to Woyin the Supreme Creator, while the fifth day witnesses the Amaseikumor divinity as the final cleansing ceremony that will guide and protect the community for the year and beyond. The grand finale on the 7th day is a celebration that brings the community and visitors together, witnessing activities including masquerades, dances, and contests featuring children, women, and men.

The Amaseikumor festival is taught via oral tradition, including storytelling, songs, and chants. Apprenticeship is also a transmission aid by learning dance, music, and craftsmanship from experienced performers. A key aspect is community participation, where everybody, regardless of age or gender is actively involved in festival activities.

Cultural institutions such as community centres, cultural groups, and traditional councils play a vital role in the transmission of knowledge and skills related to the festival. Additionally, there is a modern transmission methodology by including festival knowledge in school curriculum, transmission through social media platforms, and written publications. It brings about economic growth and coming together of community sons and daughters to unite, unique cultural display that attracts people from fat and near to Gbaramatu, political class, economic, social and otherwise as tourist attraction due to the hospitality of the people. The blessings therein during the festival are topnotch.

The grand finale is the Amaseikumor, where different dignitaries across the world attend the glamour of Ijaw cultural heritage from the Niger Delta oil rich region. The masquerade  is symbolic  as Amaseikumor followed  the tidal flow of the rituals as all activities  done on that day is calculated through  river flow, as it is going back  rituals are thrown into the river as it is captured in the photographs, the black masquerade  in the  front sweep away every negative  spirit before Amaseikumor  the king of all Masquerades,  Ogidigan,  (the king of Thunder) Owoumapere, (the King of all Masquerades) Erinanawei, (the owner of the day) Osowofinipere. Gbongbonseimutorubenwei all these are appellation to Amaseikumor because of potent powers of attraction to the positive forces of nature, peace, development and goodness to the community and the kingdom.