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PEOPLE GROUP PROFILE

The Sumba Timur of Indonesia

The Sumba Timur of Indonesia, numbering approximately 286,000 people, are No Longer Unreached. They are a dialect subgrouip of Kambera (xbr), a language of Indonesia. They are an Indigenous people in the Flores-Sumba-Alor people cluster of the Malay Peoples affinity bloc. Their primary language is Kambera and their primary religion is Protestantism.

Photo by Google. (2026). Image generated by Gemini 2.5 Flash: Sumba Timur

Fast Facts:

Affinity Group: Malay Peoples
Country: Indonesia
People Cluster: Flores-Sumba-Alor
Primary Language(s): Kambera (xbr)
Primary Religion(s): Protestantism
Population: 286,000
Strategic Progress Index (SPI): No Longer Unreached
Global Status of Evangelical Christianity (GSEC): 10% or Greater Evangelical
People Group ID: PG022744
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Pray for the Sumba Timur of Indonesia

Join others around the world in praying for the lost to be saved, the gospel to advance, the global Church to grow, and for laborers to be sent out and sustained in the harvest.

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Dig Deeper (Religion):

Primary Religion: Protestantism
Religious Affiliation: Christianity

—
%
Protestantism Adherents

Dig Deeper (Language):

Primary Language: Kambera
Language Family: Austronesian

100%
%
Kambera Speakers

Media Resources in Kambera:

Films:

Provided by the Jesus Film Project

View all resources

Bible Resources in Kambera:

Provided by Faith Comes by Hearing

Or check out the Kambera bible at Bible.com

Linked from YouVersion

View all resources

Explore Lostness and Next Steps

Unengaged and Unreached

Strategic Priority Index (SPI): Unengaged and Unreached (SPI: 2), which means there are less than 2% evangelical Christian populations among which there are no known efforts focused on establishing self-sustaining churches consistent with evangelical faith and practice.
Lostness Priority Index (LPI): Significantly Reached People Group, (LPI: 6), > 20% Evangelical.
Global Status of Evangelical Christianity (GSEC): 10% or Greater Evangelical (GSEC: 6), this people group is greater than or equal to 10% evangelical

Next steps for the Sumba Timur:
Begin signifcant prayer and fasting for this group
Send cross-cultural teams to discover and research this people group
Begin gospel seed sowing and church planting among this group

SPI: Unreached yet Engaged

The Sumba Timur are Engaged yet Unreached, which means there are less than 2% evangelical Christian populations but there are sustained efforts at establishing self-sustaining churches consistent with evangelical faith and practice.

Next steps for the Sumba Timur:
Continue prayer and fasting for this group
Continue gospel seed sowing and church planting among this group
Begin training up local leaders to lead and develop strategies to reach their own people

SPI: No longer Unreached

The Sumba Timur are No Longer Unreached, which means there are more than 2% evangelical Christian populations and there are churches consistent with evangelical faith and practice. There is still more to be done among them.

Next steps for the Sumba Timur:
Empower local believers to begin praying for their own people
Continue gospel seed sowing and church planting
Encourage local leaders to being leading church planting strategy and looking for Unreached and Unengaged groups nearby

Pray specifically for the Sumba Timur of Indonesia

While he was coming, the demon threw him to the ground and convulsed him. But Jesus rebuked the unclean spirit and healed the boy, and gave him back to his father.
readLuke 9:42

Pray that those who are living outside of the hope of the gospel will know and trust that Jesus offers freedom from the oppression of sin and hope in eternal life.

And he said to the woman, “Your faith has saved you; go in peace.”
readLuke 7:50

Pray for the good news of Jesus Christ to reach many so that they can place their faith in Him and have lasting hope.

My sheep hear my voice, and I know them, and they follow me.
readJohn 10:27

Pray that as people place their faith in Christ, they will hear God's voice and will have the great assurance that no one can snatch them from the Father’s hand.

The light shines in the darkness, and the darkness has not overcome it.
readJohn 1:5

Pray that when discouraging days come, those who cross cultures for the sake of the gospel will be comforted as they remember that the light of Christ is stronger than the darkness that surrounds them.

Sumba Across Countries (ROP3 - 114440) reported in the following countries:

To download a comprehensive people group list in spreadsheet form, visit our Research Data page.

Peoplegroups.org relies on updates from the field and other organizations for much of our data, so if you have any updates, please contact us. We use various international naming standards. For a list of these standards and fields, visit our Definitions page.

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