diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1bf0911c..ba3897b7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- ### Updates sidebar regions
+  Resolves CuBoulder/tiamat-theme#633
+  
+  Sister PR in: [tiamat10-profile](https://github.com/CuBoulder/tiamat10-profile/pull/77), ~~[ucb_site_configuration](https://github.com/CuBoulder/ucb_site_configuration/pull/45)~~
+---
+
 - ### Class Note Enhancements
   Adjusts permissions for Class Notes, adds optional image field. Resolves https://github.com/CuBoulder/tiamat-theme/issues/622
   
diff --git a/boulder_base.info.yml b/boulder_base.info.yml
index dc0f7b89..317c2cf9 100644
--- a/boulder_base.info.yml
+++ b/boulder_base.info.yml
@@ -17,9 +17,8 @@ regions:
   breadcrumb: "Breadcrumb Navigation"
   post_wide_title: "Post Wide Title"
   above_content: "Above Content"
-  left_sidebar: "Sidebar First"
   content: "Content"
-  right_sidebar: "Sidebar Second"
+  sidebar: "Sidebar"
   wide_post: "Wide Post"
   below_content: "After Content"
   second_below_content: "After Content 2"
@@ -27,4 +26,3 @@ regions:
   footer: "Footer"
   site_information: 'Site Information'
   footer_menu: 'Footer Menu'
-
diff --git a/boulder_base.theme b/boulder_base.theme
index 1776f56c..2d3258f2 100755
--- a/boulder_base.theme
+++ b/boulder_base.theme
@@ -84,6 +84,7 @@ function boulder_base_preprocess_page(array &$variables) {
   $variables['ucb_header_color'] = $headerColor = theme_get_setting('ucb_header_color');
   $variables['ucb_be_boulder'] = theme_get_setting('ucb_be_boulder');
   $variables['ucb_social_share_position'] = theme_get_setting('ucb_social_share_position');
+  $variables['ucb_sidebar_position'] = theme_get_setting('ucb_sidebar_position');
   $variables['ucb_rave_alerts'] = theme_get_setting('ucb_rave_alerts');
   $variables['ucb_sticky_menu'] = theme_get_setting('ucb_sticky_menu');
   $variables['ucb_heading_font'] = theme_get_setting('ucb_heading_font');
diff --git a/config/install/boulder_base.settings.yml b/config/install/boulder_base.settings.yml
index f15d8ec6..28eb6013 100644
--- a/config/install/boulder_base.settings.yml
+++ b/config/install/boulder_base.settings.yml
@@ -11,7 +11,7 @@ favicon:
   mimetype: image/png
 ucb_campus_header_color: '1'
 ucb_header_color: '3'
-ucb_sidebar_position: '0'
+ucb_sidebar_position: right
 ucb_be_boulder: '1'
 ucb_rave_alerts: 1
 ucb_sticky_menu: 0
diff --git a/templates/layout/page.html.twig b/templates/layout/page.html.twig
index 44f94a01..ff8d6908 100644
--- a/templates/layout/page.html.twig
+++ b/templates/layout/page.html.twig
@@ -177,40 +177,26 @@
         </div>
       {% endif %}
       {# We are checking for length below to make sure that the sidebars have any content. This is so that sidebar menus don't render the sidebars if the menu is empty #}
-      {% if (page.left_sidebar|render|striptags|trim|length > 0) or (page.right_sidebar|render|striptags|trim|length > 0) %}
-        {% if page.left_sidebar|render and page.right_sidebar|render %}
+      {% if page.sidebar|render|striptags|trim|length > 0 %}
+        {% if ucb_sidebar_position == 'left' %}
           <div class="ucb-layout-container container g-0">
             <div class="layout-row row">
               <div class="ucb-left-sidebar ucb-sidebar col-sm-12 col-md-4 col-lg-3">
-                {{ page.left_sidebar }}
-              </div>
-              <div class="ucb-layout-main col-sm-12 col-md-4 col-lg-6 ucb-has-sidebar">
-                {{ page.content }}
-              </div>
-               <div class="ucb-left-right ucb-sidebar col-sm-12 col-md-4 col-lg-3">
-                {{ page.right_sidebar }}
-              </div>
-            </div>
-          </div>
-        {% elseif page.left_sidebar|render %}
-          <div class="ucb-layout-container container g-0">
-            <div class="layout-row row">
-              <div class="ucb-left-sidebar ucb-sidebar col-sm-12 col-md-4 col-lg-3">
-                {{ page.left_sidebar }}
+                {{ page.sidebar }}
               </div>
               <div class="ucb-layout-main col-sm-12 col-md-8 col-lg-9 ucb-has-sidebar">
                 {{ page.content }}
               </div>
             </div>
           </div>
-        {% elseif page.right_sidebar|render %}
+        {% else %}
           <div class="ucb-layout-container container g-0">
             <div class="layout-row row">
               <div class="ucb-layout-main col-sm-12 col-md-8 col-lg-9 ucb-has-sidebar">
                 {{ page.content }}
               </div>
               <div class="ucb-left-right ucb-sidebar col-sm-12 col-md-4 col-lg-3">
-                {{ page.right_sidebar }}
+                {{ page.sidebar }}
               </div>
             </div>
           </div>