spatwand

A panel behind a sink or cooker that protects the wall from splashes.

• splashback (British English)
• backsplash (North American)
• splash panel

References

• https://dictionary.cambridge.org/dictionary/english/splashback
• https://dictionary.cambridge.org/dictionary/english/backsplash
• https://www.oed.com/search/dictionary/?scope=Entries&q=backsplash